(a) This chapter does not govern an adoption proceeding or a proceeding pertaining to the authorization of emergency medical care for a child.
(b) A child custody proceeding that pertains to an Indian child as defined in 25 U.S.C. 1901–1963 (Indian Child Welfare Act) is not subject to this chapter to the extent that it is governed by 25 U.S.C. 1901–1963 (Indian Child Welfare Act).